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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 7, 2023

2seventy bio, Inc.

(Exact name of registrant as specified in its charter)

Delaware			001-40791			86-3658454
(State or other jurisdiction of incorporation)			(Commission File Number)			(IRS Employer Identification No.)
60 Binney Street,						02142
Cambridge, MA
(Address of principal executive offices)						(Zip Code)

Registrant’s telephone number, including area code: (339) 499-9300

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class			Trading symbol(s)			Name of each exchange on which registered
Common Stock, par value $0.0001 per share			TSVT			The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Effective March 7, 2023, the board of directors (the “Board”) of 2seventy bio, Inc. (the “Company”), upon the recommendation of the Board’s nominating and corporate governance committee, appointed Wei Lin, M.D. to the Board as a Class II director. Dr. Lin has also been appointed to the Nominating and Corporate Governance Committee of the Board.

In connection with the appointment, on March 7, 2023, the Company granted Dr. Lin a stock option to purchase 33,400 shares of the Company’s common stock, par value $0.0001 per share (“Common Stock”), at a purchase price equal to the closing price per share of the Common Stock on the NASDAQ Global Select Market on March 7, 2023. Dr. Lin was also granted restricted stock units for 16,600 shares of Common Stock. The stock options and restricted stock units vest ratably over three years in annual installments from the date of grant, subject to continued service through the applicable vesting date.

Dr. Lin is not a party to any transaction with the Company that would require disclosure under Item 404(a) of Regulation S-K, and there are no arrangements of understandings between Dr. Lin and any other persons pursuant to which he was elected as a director.

Item 7.01 Regulation FD Disclosure.

On March 8, 2023, the Company issued a press release announcing Dr. Lin’s appointment to the Board. A copy of this press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Item 7.01 and Exhibit 99.1 attached hereto is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Exhibit No.

Description

99.1

Press release issued by 2seventy bio, Inc. on March 8, 2023.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document and incorporated as Exhibit 101)

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: March 8, 2023

2seventy bio, Inc.

By:

/s/ Chip Baird

Chip Baird

Chief Financial Officer

(Principal Financial and Accounting Officer)

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